The spelling of the word "Budger" is often confused with "Budgerigar," a type of parakeet. However, "Budger" is a colloquial term used in Australia meaning to reduce the cost of something. It is pronounced /ˈbʌdʒə/ in IPA phonetic transcription. The word is typically used in the context of budgeting or saving money. So, if you want to sound like a true Australian, remember to spell and pronounce it correctly as "Budger."
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Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.